Facebook is THE most intrusive internet company ever. Use a "Facebook Container" if you're on firefox to your extensions. Also use "Privacy Badger" with your other browsers. And if DOES NOT matter whether or not you have facebook. Anytime you see a facebook "Share" or "Like" (thumbs up) button on ANY page, facebook has access to your data.

Use multiple browsers for different activity.

Again:

Privacy Badger

Facebook Container (firefox only)

DuckDuck Go (search engine)

VPN (A MUST)